Coupling for internally and externally armored hose.



No. 816,596. PATBNTBD APR. 3, 1906. MPERZOFPN'- n y GOUPLING FUR INTERNALLY AND nxTBRNALg-YARMORBD Hos.

` companying drawing,

'UNITED sTATns PATENT. OFFICE eouPnlNG Fon |NTEYRNALLY k1b all whom.v it m'tyconcermfl it known.. that'1,N1coL As ',PERzoFF, a

E Inperor of Russia, residing at 1n the Empire of Russia, have etersburg, v

and vuseful Coupling for Interinvented anew ,L nall" and Externallylhrmored Hose, of which A the ollow'mgis a specification.

` wereiinitedA by soldering,

` screw the end of the internal flexible metallic z piece, which end is "Hither'to sheet metal and vhaving tlie external a pearance fof screw-spindiesv withl sparet ea W however, isftedious and presents the defect that the flexible 'tubes were liable to leakages owing to theirheating'. f :My 4inventidn relates to a vcoupling by means of-whichthe ends of two flexible me- .'tallictubesjof the kind described and one within-thel'other, which are divided by a concentric india-rubber hose between them, may

be 'safely connected without soldering.

The objects of -my invention are, iirst, to

tube'into the corresponding internal thread of the'e'nd of a 'tube or tubular connectingameter for receiving the end of the india-.rub-

. ber hose and is provided with a collar; second,

' to'prcvide a nut screwed on the end of the external flexible ing the "iss which' is adapted to metallic tube and is externally for the greater part provided with a fine screw-thread; third, to

age in t e iine screw-thread of the nut and 1s adaptedto bear against the collar of the tube or tubular connectingiece for tightenends of the india-ru ber hose and of the external flexible metallic tube, and, fourth7 where so preferred to provide an india-rubber packmg-ring. I 4attain these objects by the coupling illustrated in the acwhich represents a longitudinal central section through a coupling according to m invention. Y

1 denotes 't e external ilexible metallic tube made from, a strip of metallic metal which is stamped or pressed or rolled to receive this mcross-section and is afterward s irally wound externa appearance-of a screw-spindle with sry/nare thread. 2 denotes the internal exil. metallic, tube'v of a similar kind, and 3 1s theJ india=rubberhose which divides the two flexible metallic. tubes land 2 from each other.

. v VForatta,ching/ the ends or the 'india-rubber' and ofthe twoiiexible metallic ltubes 1 y I Specification ofLetters Patent. l vMinimaal ned 11m88.190s. serial-Nt. 264,321.

exible4 metallic tubes made of1 ds" leadup to ch method,"

2erab1y provided for packing inner end of the nut 4 may be recessed for exto, rally reduced in dirovide a counter-nut which can enl to form a tube of the AND EXTE-RNALLY ARMORED HOSE.

Patented April' 3, 1906.

and 2 to a tube or a tubular connecting-piece 5 the end of the latter is provided with an internal screw-thread, into which the end of the internal flexible metallic tube 2 can be screwed. Moreover, the end of' the tube or pie'ce 5 is reduced in diameter for engaging in theend of the india-rubber hose 3 and is proh vided with a collar 6. The reduced part oi? vthe end of the tube or piece 5 is rounded to the collar 6, as is clearly shown in the drawing. A nut 4 is adapted to be screwed'onthe end of the external flexible metallic tube l. It is externally provided for the greater part of its length with a iine screysthread, the internal diameter of which is slightly larger than that of the collar 6. A counter-nut 7 is provided which can engage in the external screw-thread of the nut 4 and yis Iada ted to bear against the shoulder of the co lar 6. An india-rubber ring 8 is preftlie joint. TheI the reception of the packin r-ring 8.

The coupling is operate as follows: For attaching the india-rubber hose 3 and the two flexible metallic tubes l and 2 to the tube or tubular connecting-piece 5 first the end of the internal flexible tube i. is screwed.. into the corresponding screw-thread of the tube or piece 5. Then the packing-ring 8 and'l the end ci' the hose 3 are placed on the redueed'part of the tube or piece 5, and the nut 4, screwed on the end of the external flexible tube 1, is pushed over the packing-ring 8 against the collar 6. F in'ally, the count er-nut 7 is screwed home on the nut 4, so as to press together the several parts 5, 3, 8, and 4, and thereby to tighten the joint. Obviously the two nuts 4 and 7 require to be shaped properly to facilitate the screwing and the unscrewing operations. They may be hexagonal or octa onal or they may be cylindrical and provi ed with a plurality of holes or longitudinal recesses in which suitable keys can engage. roo

screw it from the nut 4. Then the nut 4,

with the external flexible tube 1 and the hose 3,'may be pushed one after the other ofi thereduced part of the tube or piece 5, and, if

needful, the internal fiexible tube 2 may be'V withdrawn by unscrewing.

dent that the flexible vmetallic tubes can'be l r Io, From the aboveV description it will be eviconnected and disconnected mechanically by turning the countermut 7 in tho gespeotve difeotou, so that all soldefng as hithero is dispensed with.

The coupling described may be Varied without doviatng 'om the spirit of' my in- Ven'tion.

wg/Vhjzt l daim as my invention, and desire to secure by lottos atont, s-

n combination, with an inner pipe 2 amd an outing? pipe l, a, tubular conneotngfpece 5 having a portion of substantially the same diameter as the outer pipo@ projection 6 on said piece 5, Said piece 5 havingv a reduced and in which the and of the irmepipe fits,

said reduced-end curving outwardly :toward the projection 6, a rubble? hose exten i over' sai-: reduood'end .and curved po; said hose lying seffeeu the innaf and t f pipes, pekng pacsd between the @ad 'ghe hose and the projoton 6, a soreW-hreaded Sleeve 'fng over he and of pipe. anda. sleeve TI having' po'onf sore-Wed to the sleeve l :and a, pog'eoting portion engaging with the proj'gotion 6,

Witnesses:

h. A. Lofmomm. j AUGUST Elia-oms. 

